IMPACT ~ Breach Formation (WP2)

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Presentation transcript:

IMPACT ~ Breach Formation (WP2) Review of The Numerical Model predictions for Test Case 1

Outline Description of the test case Summary of the data Numerical results comparison Discussion

Description of the Test Case 2m 6m 2 1 Homogeneous Embankment Maximum Cohesive

Summary of the Data General Overtopping failure Constant upstream water level (up to 450 m3/s) Free flow downstream (No DS control) Stage-Area and Volume curves XYZ Data for 2D models Geometry Initial breach dimensions Material properties

Summary of the Data Grading curve 15% 1mm 25%

Numerical Results Comparison Breach outflow Reservoir levels Breach invert Breach width

Numerical Results Comparison Breach outflow

Numerical Results Comparison Reservoir levels

Numerical Results Comparison Breach Invert

Numerical Results Comparison Breach width

Discussion Test Data Models and Test Results Actual field test conditions varied significantly from theoretical conditions sent to modellers Incomplete survey data for the reservoir affected u/s conditions Models and Test Results Five 1D models and one 2D model were utilised Models have been developed mainly for non-cohesive embankments Wide variation in modelling results (e.g. Peak outflow from 100 m3/s to 1000 m3/s)